9.0.x sound quality.

[yannig]

Are u sure it's not just your mind playing tricks on you?

Humans "want to believe" all sorts of things without proof especially if there are others that reinforce those beliefs. In the audio enthusiast space try to avoid the Tsunami of misinformation about software.

And, if you think there is a bug in the Pi Linux kernel or in some part of Pi Bookworm OS affecting audio then post an issue to the appropriate Git repo and see if the engineers find something to investigate.

In one word : yes.
(I made enough listening tests)

But since it seems that you don't believe in it and especially that it doesn't depend on your job, I suggest not worrying too much about it.

And I don't think this is the result of a "bug" in the current kernel, but who knows.

I'll keep my fingers crossed for a future RaspiOS kernel update

In the meantime, I'll stick with the previous version.